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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
December 31
,
  
   
201
7
    
201
6
  
Accrued liabilities
:
                
Accrued vacation payabl
e
   $
1,886
     $
2,313
  
Reserves for expected losses on uncompleted contract
s
    
911
      
1,409
  
Accrued property taxe
s
    
898
      
1,096
  
Workers compensation reserve
s
    
422
      
569
  
Litigation accrua
l
    
-
      
1,750
  
Othe
r
    
2,446
      
3,788
  
Total accrued liabilitie
s
   $
6,563
     $
10,925
  
Revenue from External Customers by Geographic Areas [Table Text Block]
   
Year Ended December 31,
  
   
201
7
    
201
6
    
201
5
  
Net sales from continuing operations by geographic region
:
                        
United State
s
   $
122,179
     $
137,411
     $
161,243
  
Canad
a
    
10,601
      
11,976
      
11,917
  
Tota
l
   $
132,780
     $
149,387
     $
173,160
  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended December 31,
  
   
201
7
    
201
6
    
201
5
  
                         
Loss from continuing operation
s
   $
(8,392
 )   $
(6,741
 )   $
(17,812
 )
Loss on discontinued operation
s
    
(1,771
 )    
(2,522
 )    
(11,576
 )
Net los
s
   $
(10,163
 )   $
(9,263
 )   $
(29,388
 )
                         
Basic weighted-average common shares outstandin
g
    
9,613
      
9,588
      
9,560
  
Effect of potentially dilutive common shares
(1
)
    
-
      
-
      
-
  
Diluted weighted-average common shares outstandin
g
    
9,613
      
9,588
      
9,560
  
                         
Basic and diluted loss per common share
:
                        
Continuing operation
s
   $
(0.88
 )   $
(0.71
 )   $
(1.86
 )
Discontinued operation
s
    
(0.18
 )    
(0.26
 )    
(1.21
 )
Net loss per shar
e
   $
(1.06
 )   $
(0.97
 )   $
(3.07
 )